ABSTRACT
The analysis of natural constituents of herbal drugs, herbal drug preparations, and herbal medicinal products is generally carried out on a complex matrix where a target compound or a target class of constituents (active principles or markers) must be evaluated. This evaluation is a crucial step
both in quality control and stability testings of well-known herbal drugs, herbal drug preparations, and herbal medicinal products, but it is also important in terms of chemical screening of bioactive constituents from plants in the search for new drugs.
